fs/ceph/osd_client.h

   1 #ifndef _FS_CEPH_OSD_CLIENT_H
   2 #define _FS_CEPH_OSD_CLIENT_H
   3
   4 #include <linux/completion.h>
   5 #include <linux/kref.h>
   6 #include <linux/mempool.h>
   7 #include <linux/rbtree.h>
   8
   9 #include "types.h"
  10 #include "osdmap.h"
  11 #include "messenger.h"
  12
  13 struct ceph_msg;
  14 struct ceph_snap_context;
  15 struct ceph_osd_request;
  16 struct ceph_osd_client;
  17 struct ceph_authorizer;
  18
  19 /*
  20  * completion callback for async writepages
  21  */
  22 typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
  23                                      struct ceph_msg *);
  24
  25 /* a given osd we're communicating with */
  26 struct ceph_osd {
  27         atomic_t o_ref;
  28         struct ceph_osd_client *o_osdc;
  29         int o_osd;
  30         int o_incarnation;
  31         struct rb_node o_node;
  32         struct ceph_connection o_con;
  33         struct list_head o_requests;
  34         struct list_head o_osd_lru;
  35         struct ceph_authorizer *o_authorizer;
  36         void *o_authorizer_buf, *o_authorizer_reply_buf;
  37         size_t o_authorizer_buf_len, o_authorizer_reply_buf_len;
  38         unsigned long lru_ttl;
  39 };
  40
  41 /* an in-flight request */
  42 struct ceph_osd_request {
  43         u64             r_tid;              /* unique for this client */
  44         struct rb_node  r_node;
  45         struct list_head r_osd_item;
  46         struct ceph_osd *r_osd;
  47         struct ceph_pg   r_pgid;
  48
  49         struct ceph_connection *r_con_filling_msg;
  50
  51         struct ceph_msg  *r_request, *r_reply;
  52         int               r_result;
  53         int               r_flags;     /* any additional flags for the osd */
  54         u32               r_sent;      /* >0 if r_request is sending/sent */
  55         int               r_got_reply;
  56         int               r_num_prealloc_reply;
  57
  58         struct ceph_osd_client *r_osdc;
  59         struct kref       r_kref;
  60         bool              r_mempool;
  61         struct completion r_completion, r_safe_completion;
  62         ceph_osdc_callback_t r_callback, r_safe_callback;
  63         struct ceph_eversion r_reassert_version;
  64         struct list_head  r_unsafe_item;
  65
  66         struct inode *r_inode;                /* for use by callbacks */
  67         struct writeback_control *r_wbc;      /* ditto */
  68
  69         char              r_oid[40];          /* object name */
  70         int               r_oid_len;
  71         unsigned long     r_timeout_stamp;
  72         bool              r_resend;           /* msg send failed, needs retry */
  73
  74         struct ceph_file_layout r_file_layout;
  75         struct ceph_snap_context *r_snapc;    /* snap context for writes */
  76         unsigned          r_num_pages;        /* size of page array (follows) */
  77         struct page     **r_pages;            /* pages for data payload */
  78         int               r_pages_from_pool;
  79         int               r_own_pages;        /* if true, i own page list */
  80
  81         struct ceph_msg   *replies[2];
  82         int               cur_reply;
  83 };
  84
  85 struct ceph_osd_client {
  86         struct ceph_client     *client;
  87
  88         struct ceph_osdmap     *osdmap;       /* current map */
  89         struct rw_semaphore    map_sem;
  90         struct completion      map_waiters;
  91         u64                    last_requested_map;
  92
  93         struct mutex           request_mutex;
  94         struct rb_root         osds;          /* osds */
  95         struct list_head       osd_lru;       /* idle osds */
  96         u64                    timeout_tid;   /* tid of timeout triggering rq */
  97         u64                    last_tid;      /* tid of last request */
  98         struct rb_root         requests;      /* pending requests */
  99         int                    num_requests;
 100         struct delayed_work    timeout_work;
 101         struct delayed_work    osds_timeout_work;
 102 #ifdef CONFIG_DEBUG_FS
 103         struct dentry          *debugfs_file;
 104 #endif
 105
 106         mempool_t              *req_mempool;
 107
 108         struct ceph_msgpool     msgpool_op;
 109 };
 110
 111 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
 112                           struct ceph_client *client);
 113 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
 114
 115 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
 116                                    struct ceph_msg *msg);
 117 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
 118                                  struct ceph_msg *msg);
 119
 120 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
 121                                       struct ceph_file_layout *layout,
 122                                       struct ceph_vino vino,
 123                                       u64 offset, u64 *len, int op, int flags,
 124                                       struct ceph_snap_context *snapc,
 125                                       int do_sync, u32 truncate_seq,
 126                                       u64 truncate_size,
 127                                       struct timespec *mtime,
 128                                       bool use_mempool, int num_reply);
 129
 130 static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
 131 {
 132         kref_get(&req->r_kref);
 133 }
 134 extern void ceph_osdc_release_request(struct kref *kref);
 135 static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
 136 {
 137         kref_put(&req->r_kref, ceph_osdc_release_request);
 138 }
 139
 140 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
 141                                    struct ceph_osd_request *req,
 142                                    bool nofail);
 143 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
 144                                   struct ceph_osd_request *req);
 145 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
 146
 147 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
 148                                struct ceph_vino vino,
 149                                struct ceph_file_layout *layout,
 150                                u64 off, u64 *plen,
 151                                u32 truncate_seq, u64 truncate_size,
 152                                struct page **pages, int nr_pages);
 153
 154 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
 155                                 struct ceph_vino vino,
 156                                 struct ceph_file_layout *layout,
 157                                 struct ceph_snap_context *sc,
 158                                 u64 off, u64 len,
 159                                 u32 truncate_seq, u64 truncate_size,
 160                                 struct timespec *mtime,
 161                                 struct page **pages, int nr_pages,
 162                                 int flags, int do_sync, bool nofail);
 163
 164 #endif
 165